Could it be because I have a staggered setup on wheels? I have 18.5 wheels in the front with 245/40/R18 tires. I also have 19.5 wheels in the back with 275/35/R18 tires. They are factory, OEM AMG's with Michellin Pilot's on them. They are all performance ones except the front right one, which is an all season, but still a Michellin Pilot.

Thanx much guys, just want to narrow it down to avoid a troubleshooting nightmare at the dealer.

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2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special